In a suspended triad, the third has been replaced by another note. This is either the 2nd or the 4th. So, if we take a C major triad: C, E, G, and replace the E (third note of the C major scale) by a D (second note of the C major scale), we get C, D, G - a Csus2 triad. If we replace the E with an F, we get C, F, G - a Csus4 triad.

Note that if we took the C minor triad, C, Eb, G and replaced the Eb (which is the minor third) with D or F, we would get the exact same suspended triads. This is the reason that suspended triads are neither major or minor - the flavour of the chord (major / minor) is determined by the third.

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